Calculating angles in a triangle

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

If two angles in a triangle are 26° each, what is the third angle?

Back

The third angle is 128° (180° - 26° - 26°).

Front

What is the measure of a right angle?

Back

A right angle measures 90°.

Front

How do you calculate the missing angle in a triangle?

Back

To find the missing angle, subtract the sum of the known angles from 180°.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Front

If one angle in a triangle is 82° and another is 51°, what is the third angle?

Back

The third angle is 47° (180° - 82° - 51°).

Front

What is the formula to find the third angle in a triangle?

Back

The formula is: Third angle = 180° - (Angle 1 + Angle 2).

Front

What type of triangle has all angles less than 90°?

Back

A triangle with all angles less than 90° is called an acute triangle.